[Bug 73291] Kernel 3.13.7 boots with hybrid Intel/ATI but to blank graphical screen

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=73291

EmanueL Czirai <emanueLczirai@cryptoLab.net> changed:

           What    |Removed                     |Added
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                 CC|                            |emanueLczirai@cryptoLab.net

--- Comment #15 from EmanueL Czirai <emanueLczirai@cryptoLab.net> ---
Mar 31 15:01:10 lenovo1 kernel: x86 PAT enabled: cpu 0, old 0x7040600070406,
new 0x7010600070106

It might be a long shot but, maybe try with PAT disabled ? and if you do, you
might get this warning:
[    0.868163] [drm] Please enable CONFIG_MTRR and CONFIG_X86_PAT for better
per
formance thanks to write-combining                                              

I wrote this to another user:
"
 You could try with kernel option CONFIG_X86_PAT turned off. (I'm assuming
here, that you had it turned on; it's a child option to MTRR which is in
'Processor features' main menu in eg. 'make nconfig')
 I get random black screens right when luks password is about to be entered(and
system seems locked up) because that's when radeon switches from text mode into
frame buffer(graphics) mode, and that's when it happens(for me anyway). But
sometimes I just keep getting this black screen on startup, in which case, I
just pass radeon.modeset=0 to kernel cmdline(through grub) and this way I get
past it(because it doesn't change into graphics mode) so that I can recompile
kernel with that PAT option off; during this time you don't have KMS so X (eg.
startx) won't work.

Cheers,
EmanueL
"

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