https://bugs.freedesktop.org/show_bug.cgi?id=33851

Summary: [KMS Evergreen bisected] Crash on modeset on HP dv6-3050eo laptop Product: DRI Version: unspecified Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: critical Priority: medium Component: DRM/Radeon AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: ahlaht@gmail.com

Created an attachment (id=42866) View: https://bugs.freedesktop.org/attachment.cgi?id=42866 Review: https://bugs.freedesktop.org/review?bug=33851&attachment=42866

Hack that allows me to boot on recent kernels.

My HP Pavilion dv6-3050eo laptop does not boot anymore with 2.6.38-rc1 or 2.6.38-rc3 kernels. It freezes when doing modeset. It only boots without KMS. I bisected the problem to this commit:

commit 9ace9f7b168fef492f731ba60da5c76bc0776e6d Author: Alex Deucher alexdeucher@gmail.com Date: Thu Jan 6 21:19:26 2011 -0500

drm/radeon/kms: adjust default clock/vddc tracking for pm on DCE5

Partially reverting this patch allows me to boot with KMS on 2.6.38-rc3. I'm attaching a patch that fixes the problem for me and it also adds some printks.

Here are the results of those printks:

radeon_pm_init clock.default_sclk 10000 radeon_pm_init clock.default_mclk 15700 radeon_set_power_state sclk 10000 radeon_set_power_state clock.default_sclk 10000 radeon_set_power_state pm.default_sclk 900 radeon_set_power_state mclk 15700 radeon_set_power_state clock.default_mclk 15700 radeon_set_power_state pm.default_mclk 15701

I suppose that number 900 (9 MHz?) is causing the lockup, but I couldn't figure out where it comes from. (And apparently radeon_pm_resume is never called so that part of the patch may be just noise.)

This laptop is equipped with Intel+Evergreen switchable graphics and there is no BIOS option to turn off GPU switching. The attached patch allows me to boot with 2.6.38-rc3 KMS enabled but if I start Xorg and Radeon GPU is active the system seems to freeze again. (But this might be a different problem.) If Intel GPU is active Xorg starts just fine.

With kernel 2.6.37 (-rc8?) modesettings works AND Xorg works with both Intel and Radeon GPUs.

I suppose I also need to add that Linux Radeon 3D has never worked properly on this laptop. 3D works only on Win 7. R600c can sometimes run glxgears if I'm careful. R600g usually hard locks the computer right away. But again, this might be a different problem and I haven't been able to test this recently.