Created attachment 15960 [details] Xorg log with the git commit b6be09ff Tested on latest git: when Xorg starts, it sets the screen brightness to 0 (not sure if it is the same as 'off') - I see black screen with just a 'shadows' of login prompt. Tracking with git bisect lead to the following first bad commit: =========== commit b6be09ff1de86c8014d7605d7b6c93937252ea80 Author: Egbert Eich <eich@freedesktop.org> Date: Sun Apr 13 10:47:26 2008 +0200 Save/Restore backlight controls, obtain initial brightness from text mode. The text mode BL state gets checked and is used for the initial BL brightness value. Furthermore the text mode BL value gets restored on VT switch and exit. This patch olso contains some minor cleanup to the BL code. =========== I am attaching the Xorg log with radeonhd driver built for that commit - the suspicious line there is: (II) RADEONHD(0): LVDSSetBacklight: trying to set BL_MOD_LEVEL to: 0 The text console doesn't have the initial brightness set to zero. My card is ATI Technologies Inc M66-P [Mobility Radeon X1700]
Created attachment 15962 [details] [review] Proposed fix. Please try this patch. It's possible that BL was disabled so the 0 value was not actually set. If this patch doesn't help please post a log generated with -logverbose 7.
Assigning to reporter for feedback. Kjrill, please assign back to me when done. Thanks.
The patch didn't work. Attaching few Xorg logs with -logverbose 7
Created attachment 15974 [details] Xorg log for git version, -verbose 7, without patch
Created attachment 15975 [details] Xorg log for git version, -verbose 7, with patch
Created attachment 15976 [details] Xorg log for last good revision (3893c), -verbose 7
Comment on attachment 15975 [details] Xorg log for git version, -verbose 7, with patch marking _wrong_ log as obsolete
Created attachment 15977 [details] Xorg log for git version, -verbose 7, with patch
Reassigned back.
Modified title of bug, as it may be confusing - looks like indeed, backlight is simply off (another user in mail-list has the same issue).
Created attachment 16004 [details] [review] Another test patch. Kirill, could you please apply this patch on top of the other one and see if this works? If it doesn't please use rhd_conntest <pci_bus> -d to dump your BIOS and email it to me (eich_at_suse_de).
Created attachment 16005 [details] [review] Another test patch. Kirill, could you please apply this patch on top of the other one and see if this works? If it doesn't please use rhd_conntest <pci_bus> -d to dump your BIOS and email it to me (eich_at_suse_de).
Created attachment 16006 [details] [review] Another test patch. Kirill, could you please apply this patch on top of the other one and see if this works? If it doesn't please use rhd_conntest <pci_bus> -d to dump your BIOS and email it to me (eich_at_suse_de).
This issue should be fixed now with commit 0442f2d5b2e23648b51bbf659f5bcd874b2b438a
Confirmed, the brightness is OK with the latest git revision.
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