https://bugzilla.kernel.org/show_bug.cgi?id=74551 --- Comment #16 from maxis11 <ya.maxis11@xxxxxxxxx> --- (In reply to Alex Deucher from comment #15) > (In reply to maxis11 from comment #13) > > (In reply to Alex Deucher from comment #12) > > > (In reply to maxis11 from comment #6) > > > > BTW runpm works with 3.12.7 and 3.12.8 (with 3.13 and later runpm=1 freezes > > > > laptop during boot) > > > > > > runpm support didn't exist until 3.13. If "echo OFF > > > > /sys/kernel/debug/vgaswitcheroo/switch" has never worked, then your system > > > has never had functional support for turning on/off the dGPU. > > > > kernel 3.12.7: > > When loading SUMO2(6480g) > > That's not runpm, that's dpm (dynamic power management). Runpm turns the > dGPU off completely when it's not in use. Dpm dynamically adjusts the > clocks and voltages of the GPU when it's powered on. Prior to 3.13, runpm > was not available and the dGPU was always powered on unless you manually > powered it off via debugfs. So it seems that this is Acer BIOS problem freezes laptop, when trying to turn off dGPU. Am I right? -- You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
