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Thu, 23 Oct 2025 12:46:51 +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 yjSYB7sj+mibAgAAD6G6ig (envelope-from ); Thu, 23 Oct 2025 12:46:51 +0000 Content-Type: multipart/mixed; boundary="------------W3Z0M8wWf0unhfX0d2zFxBG1" Message-ID: <329a9f97-dd66-49c2-bc42-470566d01539@suse.de> Date: Thu, 23 Oct 2025 14:46:50 +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 , Thorsten Leemhuis References: <20251014084743.18242-1-tzimmermann@suse.de> <43992c88-3a3a-4855-9f46-27a7e5fdec2e@suse.de> <798ba37a-41d0-4953-b8f5-8fe6c00f8dd3@googlemail.com> <5f8fba3b-2ee1-4a02-9b41-e6e1de1a507a@googlemail.com> <3ca10b2e-fb9c-4495-9219-5e8537314751@googlemail.com> 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]; NEURAL_HAM_SHORT(-0.19)[-0.953]; MIME_BASE64_TEXT(0.10)[]; MIME_GOOD(-0.10)[multipart/mixed,text/plain,text/x-patch]; ARC_NA(0.00)[]; FREEMAIL_TO(0.00)[googlemail.com,lists.linux.dev,vger.kernel.org]; MID_RHS_MATCH_FROM(0.00)[]; RCPT_COUNT_TWELVE(0.00)[12]; MIME_TRACE(0.00)[0:+,1:+,2:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_ENVRCPT(0.00)[googlemail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_TLS_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,suse.de:email,imap1.dmz-prg2.suse.org:helo]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; HAS_ATTACHMENT(0.00)[] X-Spam-Flag: NO X-Spam-Score: -3.19 X-Spam-Level: This is a multi-part message in MIME format. --------------W3Z0M8wWf0unhfX0d2zFxBG1 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Am 22.10.25 um 13:23 schrieb Peter Schneider: > Am 22.10.2025 um 12:20 schrieb Thomas Zimmermann: >> Hi >> >> Am 22.10.25 um 11:16 schrieb Peter Schneider: >>> Am 22.10.2025 um 11:11 schrieb Thomas Zimmermann: >>>> Hi >>>> >>>> Am 22.10.25 um 10:08 schrieb Peter Schneider: >>>>> >>>>> Your patch applied cleanly against 6.18-rc2 and the kernel built >>>>> fine, but unfortunately it did not solve the issue: my console >>>>> screen stays blank after booting. This is regardless whether I do >>>>> a soft reboot, press the reset button or power cycle and do a cold >>>>> boot. They are all the same. >>>> >>>> Just to be sure: you do see output at the early boot stages (BIOS, >>>> boot loader). It's at some later point during boot, the driver >>>> loads and the display blanks out? >>> >>> Yes, that's correct. >>> >>>> There's another patch attached. does this make a difference? >>> >>> Do I have to apply that against base 6.18-rc2 or against 6.18-rc2 + >>> your previous patch? >> >> Base 6.18-rc2. All the patches are against this. > > So with this new patch against 6.18-rc2, I first got this build error: > >   CC [M]  drivers/gpu/drm/ast/ast_mode.o > drivers/gpu/drm/ast/ast_mode.c: In function > ‘ast_crtc_helper_atomic_disable’: > drivers/gpu/drm/ast/ast_mode.c:857:12: error: unused variable > ‘vgacr17’ [-Werror=unused-variable] >   857 |         u8 vgacr17 = 0xff; >       |            ^~~~~~~ > cc1: all warnings being treated as errors > > > because I always do my kernel builds with CONFIG_WERROR=y. So then I > commented out the now superfluous declaration in line 857 and the > build succeeded. However, unfortunately the issue still persists. The > screen still gets blanked on reboot (as clarified before, after > BIOS/POST messages, Grub boot menu, initial boot messages). I've been able to reproduce the problem with an AST2300 test system. The attached patch fixes the problem for me. Can you please test and report on the results? Best regards Thomas > > 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) --------------W3Z0M8wWf0unhfX0d2zFxBG1 Content-Type: text/x-patch; charset=UTF-8; name="0001-ast-clear-preserved-bits-from-output-value.patch" Content-Disposition: attachment; filename="0001-ast-clear-preserved-bits-from-output-value.patch" Content-Transfer-Encoding: base64 RnJvbSBiOWE5MGQ5ZWYyNjZkNWY5ZDNhZWI5NzBhZTM1ZTEwYjcxNmZjNDY2IE1vbiBTZXAg MTcgMDA6MDA6MDAgMjAwMQpGcm9tOiBUaG9tYXMgWmltbWVybWFubiA8dHppbW1lcm1hbm5A c3VzZS5kZT4KRGF0ZTogVGh1LCAyMyBPY3QgMjAyNSAxNDozMDoyOSArMDIwMApTdWJqZWN0 OiBbUEFUQ0hdIGFzdDogY2xlYXIgcHJlc2VydmVkIGJpdHMgZnJvbSBvdXRwdXQgdmFsdWUK Ci0tLQogZHJpdmVycy9ncHUvZHJtL2FzdC9hc3RfZHJ2LmggfCA5ICsrKysrLS0tLQogMSBm aWxlIGNoYW5nZWQsIDUgaW5zZXJ0aW9ucygrKSwgNCBkZWxldGlvbnMoLSkKCmRpZmYgLS1n aXQgYS9kcml2ZXJzL2dwdS9kcm0vYXN0L2FzdF9kcnYuaCBiL2RyaXZlcnMvZ3B1L2RybS9h c3QvYXN0X2Rydi5oCmluZGV4IDdiZTM2YTM1OGU3NC4uNjAyYmZmN2Y5OGQ5IDEwMDY0NAot LS0gYS9kcml2ZXJzL2dwdS9kcm0vYXN0L2FzdF9kcnYuaAorKysgYi9kcml2ZXJzL2dwdS9k cm0vYXN0L2FzdF9kcnYuaApAQCAtMjk4LDEzICsyOTgsMTQgQEAgc3RhdGljIGlubGluZSB2 b2lkIF9fYXN0X3dyaXRlOF9pKHZvaWQgX19pb21lbSAqYWRkciwgdTMyIHJlZywgdTggaW5k ZXgsIHU4IHZhbCkKIAlfX2FzdF93cml0ZTgoYWRkciwgcmVnICsgMSwgdmFsKTsKIH0KIAot c3RhdGljIGlubGluZSB2b2lkIF9fYXN0X3dyaXRlOF9pX21hc2tlZCh2b2lkIF9faW9tZW0g KmFkZHIsIHUzMiByZWcsIHU4IGluZGV4LCB1OCByZWFkX21hc2ssCitzdGF0aWMgaW5saW5l IHZvaWQgX19hc3Rfd3JpdGU4X2lfbWFza2VkKHZvaWQgX19pb21lbSAqYWRkciwgdTMyIHJl ZywgdTggaW5kZXgsIHU4IHByZXNlcnZlX21hc2ssCiAJCQkJCSB1OCB2YWwpCiB7Ci0JdTgg dG1wID0gX19hc3RfcmVhZDhfaV9tYXNrZWQoYWRkciwgcmVnLCBpbmRleCwgcmVhZF9tYXNr KTsKKwl1OCB0bXAgPSBfX2FzdF9yZWFkOF9pX21hc2tlZChhZGRyLCByZWcsIGluZGV4LCBw cmVzZXJ2ZV9tYXNrKTsKIAotCXRtcCB8PSB2YWw7Ci0JX19hc3Rfd3JpdGU4X2koYWRkciwg cmVnLCBpbmRleCwgdG1wKTsKKwl2YWwgJj0gfnByZXNlcnZlX21hc2s7CisKKwlfX2FzdF93 cml0ZThfaShhZGRyLCByZWcsIGluZGV4LCB0bXAgfCB2YWwpOwogfQogCiBzdGF0aWMgaW5s aW5lIHUzMiBhc3RfcmVhZDMyKHN0cnVjdCBhc3RfZGV2aWNlICphc3QsIHUzMiByZWcpCi0t IAoyLjUxLjAKCg== --------------W3Z0M8wWf0unhfX0d2zFxBG1--