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Wed, 22 Oct 2025 06:51:30 +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 LsNgO/J++GgjcAAAD6G6ig (envelope-from ); Wed, 22 Oct 2025 06:51:30 +0000 Content-Type: multipart/mixed; boundary="------------IFq0UOMYTWshbPHE0miIKq0X" Message-ID: <43992c88-3a3a-4855-9f46-27a7e5fdec2e@suse.de> Date: Wed, 22 Oct 2025 08:51:30 +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: [REGRESSION][BISECTED] Screen goes blank with ASpeed AST2300 in 6.18-rc2 To: Peter Schneider , regressions@lists.linux.dev, LKML Cc: dri-devel@lists.freedesktop.org, stable@vger.kernel.org, jfalempe@redhat.com, airlied@redhat.com, dianders@chromium.org, nbowler@draconx.ca, Linus Torvalds , Greg Kroah-Hartman References: <20251014084743.18242-1-tzimmermann@suse.de> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; 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BAYES_HAM(-3.00)[100.00%]; MIME_BASE64_TEXT_BOGUS(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[multipart/mixed,text/plain,text/x-patch]; MIME_BASE64_TEXT(0.10)[]; MX_GOOD(-0.01)[]; URIBL_BLOCKED(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns,suse.de:email,suse.de:mid,suse.de:dkim]; FREEMAIL_TO(0.00)[googlemail.com,lists.linux.dev,vger.kernel.org]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; TO_DN_SOME(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MIME_TRACE(0.00)[0:+,1:+,2:+]; ARC_NA(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FREEMAIL_ENVRCPT(0.00)[googlemail.com]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; MID_RHS_MATCH_FROM(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCPT_COUNT_SEVEN(0.00)[11]; RCVD_VIA_SMTP_AUTH(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; HAS_ATTACHMENT(0.00)[]; DKIM_TRACE(0.00)[suse.de:+]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns,suse.de:email,suse.de:mid,suse.de:dkim] X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Score: -3.41 X-Spam-Level: This is a multi-part message in MIME format. --------------IFq0UOMYTWshbPHE0miIKq0X Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Am 22.10.25 um 05:27 schrieb Peter Schneider: > #regzbot introduced: 6f719373b943a955fee6fc2012aed207b65e2854 > > Hi all, > > I have encountered a serious (for me) regression with 6.18-rc2 on my > 2-socket Ivy Bridge Xeon E5-2697 v2 server. After booting, my console > screen goes blank and stays blank. 6.18-rc1 was still fine. > > The machine has an Asus Z9PE-D16 server mainboard with an onboard > ASpeed AST2300 VGA chip with 16MB VRAM. I have attached an older HP > Monitor to it via old VGA jack/cable. It also has a second graphics > card in a PCI-E slot; an older NVidia GTX 560. It is not connected to > a monitor, but I have configured it via kernel command line for > PCI-pass-through to VMs running on this server (I use Proxmox VE, i.e. > QEMU/KVM virtual machines). Currently, no VMs use this yet, and also > no VMs are autostarting with machine boot. So when this regression > occurs, the server is idle. Pressing a key on the keyboard does not > make the screen come alive. The server is running fine though, and I > can access it via SSH. It just has no graphic output anymore. In case > this is important, the machine also has a ASMB6 BMC (can be used via > http). > > I have attached dmesg output from both 6.18-rc1 which is fine, and > 6.18-rc2 which exhibits this bug. I have bisected the issue, please > see attached git bisect.log. Thanks for the detailed bug report. Attached is a patch that partially reverts the broken commit. Could you please apply it on top of the broken kernel and report on the results? Best regards Thomas > > The bad commit is > > commit 6f719373b943a955fee6fc2012aed207b65e2854 > Author: Thomas Zimmermann > Date:   Tue Oct 14 10:46:34 2025 +0200 > >     drm/ast: Blank with VGACR17 sync enable, always clear VGACRB6 sync > off > >     Blank the display by disabling sync pulses with VGACR17<7>. Unblank >     by reenabling them. This VGA setting should be supported by all > Aspeed >     hardware. > > When I revert this from 6.18-rc2, the issue goes away and my console > screen works again. > > I just saw that Greg just yesterday evening included the offending > patch already in stable RCs 6.12.55-rc1 and 6.17.5-rc1, so I'll test > these seperately and send a mail to the stable mailing list, too, if > affected (which I anticipate). > > Beste Grüße, > Peter Schneider > -- -- 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) --------------IFq0UOMYTWshbPHE0miIKq0X Content-Type: text/x-patch; charset=UTF-8; name="0001-ast-Set-clear-screen-disable-bit.patch" Content-Disposition: attachment; filename="0001-ast-Set-clear-screen-disable-bit.patch" Content-Transfer-Encoding: base64 RnJvbSA1ZmRlYTJlOTkzNmE0OTkwNTkwMmUzMzllNjI3YTI3YjBhYjBhODg0IE1vbiBTZXAg MTcgMDA6MDA6MDAgMjAwMQpGcm9tOiBUaG9tYXMgWmltbWVybWFubiA8dHppbW1lcm1hbm5A c3VzZS5kZT4KRGF0ZTogV2VkLCAyMiBPY3QgMjAyNSAwODo0ODo0OSArMDIwMApTdWJqZWN0 OiBbUEFUQ0hdIGFzdDogU2V0L2NsZWFyIHNjcmVlbi1kaXNhYmxlIGJpdAoKLS0tCiBkcml2 ZXJzL2dwdS9kcm0vYXN0L2FzdF9tb2RlLmMgfCA4ICsrKysrKysrCiAxIGZpbGUgY2hhbmdl ZCwgOCBpbnNlcnRpb25zKCspCgpkaWZmIC0tZ2l0IGEvZHJpdmVycy9ncHUvZHJtL2FzdC9h c3RfbW9kZS5jIGIvZHJpdmVycy9ncHUvZHJtL2FzdC9hc3RfbW9kZS5jCmluZGV4IDljZTg3 NGRiYTY5Yy4uYjczNDM3MDgzZGJmIDEwMDY0NAotLS0gYS9kcml2ZXJzL2dwdS9kcm0vYXN0 L2FzdF9tb2RlLmMKKysrIGIvZHJpdmVycy9ncHUvZHJtL2FzdC9hc3RfbW9kZS5jCkBAIC04 MjAsNiArODIwLDcgQEAgYXN0X2NydGNfaGVscGVyX2F0b21pY19mbHVzaChzdHJ1Y3QgZHJt X2NydGMgKmNydGMsCiBzdGF0aWMgdm9pZCBhc3RfY3J0Y19oZWxwZXJfYXRvbWljX2VuYWJs ZShzdHJ1Y3QgZHJtX2NydGMgKmNydGMsIHN0cnVjdCBkcm1fYXRvbWljX3N0YXRlICpzdGF0 ZSkKIHsKIAlzdHJ1Y3QgYXN0X2RldmljZSAqYXN0ID0gdG9fYXN0X2RldmljZShjcnRjLT5k ZXYpOworCXU4IHZnYXNyMSA9IDB4ZmY7CiAJdTggdmdhY3IxNyA9IDB4MDA7CiAJdTggdmdh Y3JiNiA9IDB4ZmY7CiAKQEAgLTgyOCw2ICs4MjksOSBAQCBzdGF0aWMgdm9pZCBhc3RfY3J0 Y19oZWxwZXJfYXRvbWljX2VuYWJsZShzdHJ1Y3QgZHJtX2NydGMgKmNydGMsIHN0cnVjdCBk cm1fYXRvbQogCiAJYXN0X3NldF9pbmRleF9yZWdfbWFzayhhc3QsIEFTVF9JT19WR0FDUkks IDB4MTcsIDB4N2YsIHZnYWNyMTcpOwogCWFzdF9zZXRfaW5kZXhfcmVnX21hc2soYXN0LCBB U1RfSU9fVkdBQ1JJLCAweGI2LCAweGZjLCB2Z2FjcmI2KTsKKworCXZnYXNyMSAmPSB+QVNU X0lPX1ZHQVNSMV9TRDsKKwlhc3Rfc2V0X2luZGV4X3JlZ19tYXNrKGFzdCwgQVNUX0lPX1ZH QVNSSSwgMHgwMSwgMHhkZiwgdmdhc3IxKTsKIH0KIAogc3RhdGljIHZvaWQgYXN0X2NydGNf aGVscGVyX2F0b21pY19kaXNhYmxlKHN0cnVjdCBkcm1fY3J0YyAqY3J0Yywgc3RydWN0IGRy bV9hdG9taWNfc3RhdGUgKnN0YXRlKQpAQCAtODM1LDYgKzgzOSwxMCBAQCBzdGF0aWMgdm9p ZCBhc3RfY3J0Y19oZWxwZXJfYXRvbWljX2Rpc2FibGUoc3RydWN0IGRybV9jcnRjICpjcnRj LCBzdHJ1Y3QgZHJtX2F0bwogCXN0cnVjdCBkcm1fY3J0Y19zdGF0ZSAqb2xkX2NydGNfc3Rh dGUgPSBkcm1fYXRvbWljX2dldF9vbGRfY3J0Y19zdGF0ZShzdGF0ZSwgY3J0Yyk7CiAJc3Ry dWN0IGFzdF9kZXZpY2UgKmFzdCA9IHRvX2FzdF9kZXZpY2UoY3J0Yy0+ZGV2KTsKIAl1OCB2 Z2FjcjE3ID0gMHhmZjsKKwl1OCB2Z2FzcjEgPSAweDAwOworCisJdmdhc3IxIHw9IEFTVF9J T19WR0FTUjFfU0Q7CisJYXN0X3NldF9pbmRleF9yZWdfbWFzayhhc3QsIEFTVF9JT19WR0FT UkksIDB4MDEsIDB4ZGYsIHZnYXNyMSk7CiAKIAl2Z2FjcjE3ICY9IH5BU1RfSU9fVkdBQ1Ix N19TWU5DX0VOQUJMRTsKIAlhc3Rfc2V0X2luZGV4X3JlZ19tYXNrKGFzdCwgQVNUX0lPX1ZH QUNSSSwgMHgxNywgMHg3ZiwgdmdhY3IxNyk7Ci0tIAoyLjUxLjAKCg== --------------IFq0UOMYTWshbPHE0miIKq0X--