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Tue, 7 Oct 2025 08:51:30 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id HDT0BpLU5GjZQwAAD6G6ig (envelope-from ); Tue, 07 Oct 2025 08:51:30 +0000 Content-Type: multipart/mixed; boundary="------------BKHzetE687peU8NbqM0brEVV" Message-ID: Date: Tue, 7 Oct 2025 10:51:29 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: PROBLEM: AST2500 BMC video output disabled by reboot (regression) To: Nick Bowler Cc: Doug Anderson , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, regressions@lists.linux.dev References: <5949fd73-3ca4-4bd9-8092-2d9923dcbfd3@suse.de> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; keydata= xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdg XH47fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0 BeB5BbqP5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4Yc hdHm3bkPjz9EErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB 9GluwvIhSezPgnEmimZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEB AAHNJ1Rob21hcyBaaW1tZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmRlPsLAjgQTAQgAOAIb AwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftODH AAoJEGgNwR1TC3ojx1wH/0hKGWugiqDgLNXLRD/4TfHBEKmxIrmfu9Z5t7vwUKfwhFL6hqvo lXPJJKQpQ2z8+X2vZm/slsLn7J1yjrOsoJhKABDi+3QWWSGkaGwRJAdPVVyJMfJRNNNIKwVb U6B1BkX2XDKDGffF4TxlOpSQzdtNI/9gleOoUA8+jy8knnDYzjBNOZqLG2FuTdicBXblz0Mf vg41gd9kCwYXDnD91rJU8tzylXv03E75NCaTxTM+FBXPmsAVYQ4GYhhgFt8S2UWMoaaABLDe 7l5FdnLdDEcbmd8uLU2CaG4W2cLrUaI4jz2XbkcPQkqTQ3EB67hYkjiEE6Zy3ggOitiQGcqp j//OwE0EWznS4AEIAMYmP4M/V+T5RY5at/g7rUdNsLhWv1APYrh9RQefODYHrNRHUE9eosYb T6XMryR9hT8XlGOYRwKWwiQBoWSDiTMo/Xi29jUnn4BXfI2px2DTXwc22LKtLAgTRjP+qbU6 3Y0xnQN29UGDbYgyyK51DW3H0If2a3JNsheAAK+Xc9baj0LGIc8T9uiEWHBnCH+RdhgATnWW GKdDegUR5BkDfDg5O/FISymJBHx2Dyoklv5g4BzkgqTqwmaYzsl8UxZKvbaxq0zbehDda8lv hFXodNFMAgTLJlLuDYOGLK2AwbrS3Sp0AEbkpdJBb44qVlGm5bApZouHeJ/+n+7r12+lqdsA EQEAAcLAdgQYAQgAIAIbDBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftOH6AAoJEGgNwR1T C3ojVSkIALpAPkIJPQoURPb1VWjh34l0HlglmYHvZszJWTXYwavHR8+k6Baa6H7ufXNQtThR yIxJrQLW6rV5lm7TjhffEhxVCn37+cg0zZ3j7zIsSS0rx/aMwi6VhFJA5hfn3T0TtrijKP4A SAQO9xD1Zk9/61JWk8OysuIh7MXkl0fxbRKWE93XeQBhIJHQfnc+YBLprdnxR446Sh8Wn/2D Ya8cavuWf2zrB6cZurs048xe0UbSW5AOSo4V9M0jzYI4nZqTmPxYyXbm30Kvmz0rYVRaitYJ 4kyYYMhuULvrJDMjZRvaNe52tkKAvMevcGdt38H4KSVXAylqyQOW5zvPc4/sq9c= In-Reply-To: X-Spam-Level: X-Spamd-Result: default: False [-3.20 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MIME_BASE64_TEXT_BOGUS(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.996]; MIME_BASE64_TEXT(0.10)[]; MIME_GOOD(-0.10)[multipart/mixed,text/plain,text/x-patch]; RCVD_VIA_SMTP_AUTH(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; MID_RHS_MATCH_FROM(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:+,3:+]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,suse.de:mid,imap1.dmz-prg2.suse.org:helo]; HAS_ATTACHMENT(0.00)[] X-Spam-Flag: NO X-Spam-Score: -3.20 This is a multi-part message in MIME format. --------------BKHzetE687peU8NbqM0brEVV Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Am 04.10.25 um 02:31 schrieb Nick Bowler: > On Wed, Oct 01, 2025 at 09:26:28AM +0200, Thomas Zimmermann wrote: >> Am 18.09.25 um 13:17 schrieb Thomas Zimmermann: >>> Am 18.09.25 um 04:04 schrieb Nick Bowler: >>>> On Wed, Sep 17, 2025 at 11:14:45AM -0400, Nick Bowler wrote: >>>>> On Fri, Aug 29, 2025 at 03:07:14PM +0200, Thomas Zimmermann wrote: >>>>>> The ast driver doesn't do much during shutdown. Could you >>>>>> please out-comment the lines at either [2] xor [3] and report >>>>>> on either effect? > [...] >>>>>> [2] https://elixir.bootlin.com/linux/v6.16.3/source/drivers/gpu/drm/ast/ast_mode.c#L835 >>>>>> [3] https://elixir.bootlin.com/linux/v6.16.3/source/drivers/gpu/drm/ast/ast_mode.c#L839 > [...] >>>>    - Deleting [3] (only) appears sufficient to make things work again, >>>>      that is, deleting the following line in ast_mode.c: >>>> >>>>        ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xb6, 0xfc, vgacrb6); >>> Please test if the attached patch fixes the problem for you. >> Have you been able to test the patch? > In the normal scenario where everything is working and I reboot, then > the display remains on for the firmware (this would seem to be an > improvement). > > But it introduces a new problem: the screen no longer turns back on if > I boot the patched kernel from the "display off" state. The unpatched > 6.17 kernel would at least turn the display back on from this. > Furthermore, rebooting from this state keeps the display off. > > The earlier change [3] above has no such problems. Thanks again for testing. Looks like your BMC is especially picky about these settings. :) Attached are two patches; each trying to eliminate one of the possible causes. Could you please test them individually and report the results? Best regards Thomas > > Thanks, > Nick -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg) --------------BKHzetE687peU8NbqM0brEVV Content-Type: text/x-patch; charset=UTF-8; name="0001-ast-Use-VGACR17-sync-enable-and-VGACRB6-sync-off.patch" Content-Disposition: attachment; filename*0="0001-ast-Use-VGACR17-sync-enable-and-VGACRB6-sync-off.patch" Content-Transfer-Encoding: base64 RnJvbSAzZWE5MTc2MmFkMDc3ZjQ5MTQzYWU2Y2JmNDgwMjAzODZhMmVjYzY1IE1vbiBTZXAg MTcgMDA6MDA6MDAgMjAwMQpGcm9tOiBUaG9tYXMgWmltbWVybWFubiA8dHppbW1lcm1hbm5A c3VzZS5kZT4KRGF0ZTogVGh1LCAxOCBTZXAgMjAyNSAwOTo1MDoyOCArMDIwMApTdWJqZWN0 OiBbUEFUQ0hdIGFzdDogVXNlIFZHQUNSMTcgc3luYyBlbmFibGUgYW5kIFZHQUNSQjYgc3lu YyBvZmYKCkJsYW5rIHRoZSBkaXNwbGF5IGJ5IGRpc2FibGluZyBzeW5jIHB1bHNlcyB3aXRo IFZHQUNSMTc8Nz4uIFNvbWUKQk1DJ3MgZG9uJ3QgaGFuZGxlIFZHQUNSQjYgY29ycmVjdGx5 LiBBbmQgZG9uJ3QgbW9kaWZ5IFZHQVNSMSdzIFNECmJpdCwgd2hpY2ggb25seSBkaXNhYmxl cyBHUFUgYWNjZXNzIHRvIFZSQU0uCi0tLQogZHJpdmVycy9ncHUvZHJtL2FzdC9hc3RfbW9k ZS5jIHwgMTggKysrKysrKysrKy0tLS0tLS0tCiBkcml2ZXJzL2dwdS9kcm0vYXN0L2FzdF9y ZWcuaCAgfCAgMSArCiAyIGZpbGVzIGNoYW5nZWQsIDExIGluc2VydGlvbnMoKyksIDggZGVs ZXRpb25zKC0pCgpkaWZmIC0tZ2l0IGEvZHJpdmVycy9ncHUvZHJtL2FzdC9hc3RfbW9kZS5j IGIvZHJpdmVycy9ncHUvZHJtL2FzdC9hc3RfbW9kZS5jCmluZGV4IDZiOWQ1MTBjNTA5ZC4u ZmU4MDg5MjY2ZGI1IDEwMDY0NAotLS0gYS9kcml2ZXJzL2dwdS9kcm0vYXN0L2FzdF9tb2Rl LmMKKysrIGIvZHJpdmVycy9ncHUvZHJtL2FzdC9hc3RfbW9kZS5jCkBAIC04MzYsMjIgKzgz NiwyNCBAQCBhc3RfY3J0Y19oZWxwZXJfYXRvbWljX2ZsdXNoKHN0cnVjdCBkcm1fY3J0YyAq Y3J0YywKIHN0YXRpYyB2b2lkIGFzdF9jcnRjX2hlbHBlcl9hdG9taWNfZW5hYmxlKHN0cnVj dCBkcm1fY3J0YyAqY3J0Yywgc3RydWN0IGRybV9hdG9taWNfc3RhdGUgKnN0YXRlKQogewog CXN0cnVjdCBhc3RfZGV2aWNlICphc3QgPSB0b19hc3RfZGV2aWNlKGNydGMtPmRldik7CisJ dTggdmdhY3IxNyA9IDB4MDA7CisJdTggdmdhY3JiNiA9IDB4MDA7CiAKLQlhc3Rfc2V0X2lu ZGV4X3JlZ19tYXNrKGFzdCwgQVNUX0lPX1ZHQUNSSSwgMHhiNiwgMHhmYywgMHgwMCk7Ci0J YXN0X3NldF9pbmRleF9yZWdfbWFzayhhc3QsIEFTVF9JT19WR0FTUkksIDB4MDEsIDB4ZGYs IDB4MDApOworCXZnYWNyMTcgfD0gQVNUX0lPX1ZHQUNSMTdfU1lOQ19FTkFCTEU7CisJdmdh Y3JiNiAmPSB+KEFTVF9JT19WR0FDUkI2X1ZTWU5DX09GRiB8IEFTVF9JT19WR0FDUkI2X0hT WU5DX09GRik7CisKKwlhc3Rfc2V0X2luZGV4X3JlZ19tYXNrKGFzdCwgQVNUX0lPX1ZHQUNS SSwgMHgxNywgMHg3ZiwgdmdhY3IxNyk7CisJYXN0X3NldF9pbmRleF9yZWdfbWFzayhhc3Qs IEFTVF9JT19WR0FDUkksIDB4YjYsIDB4ZmMsIHZnYWNyYjYpOwogfQogCiBzdGF0aWMgdm9p ZCBhc3RfY3J0Y19oZWxwZXJfYXRvbWljX2Rpc2FibGUoc3RydWN0IGRybV9jcnRjICpjcnRj LCBzdHJ1Y3QgZHJtX2F0b21pY19zdGF0ZSAqc3RhdGUpCiB7CiAJc3RydWN0IGRybV9jcnRj X3N0YXRlICpvbGRfY3J0Y19zdGF0ZSA9IGRybV9hdG9taWNfZ2V0X29sZF9jcnRjX3N0YXRl KHN0YXRlLCBjcnRjKTsKIAlzdHJ1Y3QgYXN0X2RldmljZSAqYXN0ID0gdG9fYXN0X2Rldmlj ZShjcnRjLT5kZXYpOwotCXU4IHZnYWNyYjY7CisJdTggdmdhY3IxNyA9IDB4ZmY7CiAKLQlh c3Rfc2V0X2luZGV4X3JlZ19tYXNrKGFzdCwgQVNUX0lPX1ZHQVNSSSwgMHgwMSwgMHhkZiwg QVNUX0lPX1ZHQVNSMV9TRCk7Ci0KLQl2Z2FjcmI2ID0gQVNUX0lPX1ZHQUNSQjZfVlNZTkNf T0ZGIHwKLQkJICBBU1RfSU9fVkdBQ1JCNl9IU1lOQ19PRkY7Ci0JYXN0X3NldF9pbmRleF9y ZWdfbWFzayhhc3QsIEFTVF9JT19WR0FDUkksIDB4YjYsIDB4ZmMsIHZnYWNyYjYpOworCXZn YWNyMTcgJj0gfkFTVF9JT19WR0FDUjE3X1NZTkNfRU5BQkxFOworCWFzdF9zZXRfaW5kZXhf cmVnX21hc2soYXN0LCBBU1RfSU9fVkdBQ1JJLCAweDE3LCAweDdmLCB2Z2FjcjE3KTsKIAog CS8qCiAJICogSFcgY3Vyc29ycyByZXF1aXJlIHRoZSB1bmRlcmx5aW5nIHByaW1hcnkgcGxh bmUgYW5kIENSVEMgdG8KZGlmZiAtLWdpdCBhL2RyaXZlcnMvZ3B1L2RybS9hc3QvYXN0X3Jl Zy5oIGIvZHJpdmVycy9ncHUvZHJtL2FzdC9hc3RfcmVnLmgKaW5kZXggZTE1YWRhZjNhODBl Li4zMDU3OGUzYjA3ZTQgMTAwNjQ0Ci0tLSBhL2RyaXZlcnMvZ3B1L2RybS9hc3QvYXN0X3Jl Zy5oCisrKyBiL2RyaXZlcnMvZ3B1L2RybS9hc3QvYXN0X3JlZy5oCkBAIC0yOSw2ICsyOSw3 IEBACiAjZGVmaW5lIEFTVF9JT19WR0FHUkkJCQkoMHg0RSkKIAogI2RlZmluZSBBU1RfSU9f VkdBQ1JJCQkJKDB4NTQpCisjZGVmaW5lIEFTVF9JT19WR0FDUjE3X1NZTkNfRU5BQkxFCUJJ VCg3KSAvKiBjYWxsZWQgIkhhcmR3YXJlIHJlc2V0IiBpbiBkb2NzICovCiAjZGVmaW5lIEFT VF9JT19WR0FDUjgwX1BBU1NXT1JECQkoMHhhOCkKICNkZWZpbmUgQVNUX0lPX1ZHQUNSOTlf VkdBTUVNX1JTUlZfTUFTSwlHRU5NQVNLKDEsIDApCiAjZGVmaW5lIEFTVF9JT19WR0FDUkEx X1ZHQUlPX0RJU0FCTEVECUJJVCgxKQotLSAKMi41MS4wCgo= --------------BKHzetE687peU8NbqM0brEVV Content-Type: text/x-patch; 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