https://bugzilla.kernel.org/show_bug.cgi?id=88501
Bug ID: 88501 Summary: AMD/ATI RS690M Console blanks to white Product: Drivers Version: 2.5 Kernel Version: 3.6.0-rc5 to 3.18.0-rc4 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: business.kid@gmail.com Regression: Yes
Created attachment 158181 --> https://bugzilla.kernel.org/attachment.cgi?id=158181&action=edit Git Bisect log, & git visualise o/p
Without X running, linux consoles blank after a period adjustable by setterm. Mine does not. It goes white. If I invert the screen colours, it goes whiter. Backlight? I cloned the Linus-stable git and tried it. 3.18.0-rc4 twists this slightly - The FIRST time the screen blanks, it does so correctly; every other time, it blanks to white. I'm a hardware guy, not a software expert. Git bisect gives the output below. Details of the box also attached
The box is a HP 6715S, twin core Turion, 3G ram. It's running Slackware-current as of Sept 30th, 2014. LSPCI output attached. Bios Version: ATI 02/13/08,1.
https://bugzilla.kernel.org/show_bug.cgi?id=88501
--- Comment #1 from business.kid@gmail.com --- Created attachment 158191 --> https://bugzilla.kernel.org/attachment.cgi?id=158191&action=edit LSPCI -vnn
https://bugzilla.kernel.org/show_bug.cgi?id=88501
--- Comment #2 from business.kid@gmail.com --- Created attachment 158201 --> https://bugzilla.kernel.org/attachment.cgi?id=158201&action=edit Kernel Config 3.6.0-rc5+
https://bugzilla.kernel.org/show_bug.cgi?id=88501
Alex Deucher alexdeucher@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |alexdeucher@gmail.com
--- Comment #3 from Alex Deucher alexdeucher@gmail.com --- Does booting a recent kernel with radeon.backlight=0 fix the issue?
https://bugzilla.kernel.org/show_bug.cgi?id=88501
--- Comment #4 from Alex Deucher alexdeucher@gmail.com --- Created attachment 158211 --> https://bugzilla.kernel.org/attachment.cgi?id=158211&action=edit possible fix
Does this patch fix the issue (against 3.17 or newer kernel)?
https://bugzilla.kernel.org/show_bug.cgi?id=88501
--- Comment #5 from business.kid@gmail.com --- <Does booting a recent kernel with radeon.backlight=0 fix the issue?> Yes, this fixes the issue on 3.18-rc4
<Does this patch fix the issue (against 3.17 or newer kernel)?> No, it does not. I get the same behaviour - first time it blanks to dark, every other time it blanks to white.
I am a very rusty amateur at C, but I will adjust that patch very slightly here and have another go.
https://bugzilla.kernel.org/show_bug.cgi?id=88501
--- Comment #6 from business.kid@gmail.com --- Created attachment 158261 --> https://bugzilla.kernel.org/attachment.cgi?id=158261&action=edit Your patch slightly adjusted
This seems to work. I know little of C, and less of graphics programming, but I got suspicious of the second 'if' construct inside a chain bracket, so I tweaked syntax. I built it here and tried it.
I now am sorted out, thank you. If you want something else tried, let me know. Otherwise, I assure you, I will *not* be building another kernel on that box for quite some time!
https://bugzilla.kernel.org/show_bug.cgi?id=88501
--- Comment #7 from Alex Deucher alexdeucher@gmail.com --- The code should be fine as is. Are you sure you tested the right kernel?
https://bugzilla.kernel.org/show_bug.cgi?id=88501
--- Comment #8 from business.kid@gmail.com --- Yes. I tested in order 1. 3.18.0-rc4 with no patch - white 2nd time. 2. 3.18.0-rc4 with the boot option - dark every time 3. 3.18.0-rc4 with your patch applied and no boot option - white 2nd time 4. 3.18.0-rc4 with a syntax error :-/ module did not load. 5. 3.18.0-rc4 with the attached suggested fix, and no boot option. - dark every time.
I have built ~ 20 kernels in the last few days, and am not keeping any of them. The only reason I edited the patch was that I felt it unsafe to put an 'if' below an 'else' in the same chain bracket. I have met some compilers that don't respond to that as one would expect. I don't know what gcc does, and can't swear that the logic follows correctly. I just tried it.
https://bugzilla.kernel.org/show_bug.cgi?id=88501
pr0v1d3nc14@riseup.net changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |pr0v1d3nc14@riseup.net
--- Comment #9 from pr0v1d3nc14@riseup.net --- Have the same problem and no idea how to patch :( some may help? RS690M on AMD Thurion 64x2...
https://bugzilla.kernel.org/show_bug.cgi?id=88501
--- Comment #10 from Alex Deucher alexdeucher@gmail.com --- The fix is already upstream. Alternatively, you can boot with radeon.backlight=0 on the kernel command line in grub.
https://bugzilla.kernel.org/show_bug.cgi?id=88501
crocket (crockabiscuit@gmail.com) changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |crockabiscuit@gmail.com
--- Comment #11 from crocket (crockabiscuit@gmail.com) --- https://bugzilla.kernel.org/show_bug.cgi?id=202739 might be a fix.
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