https://bugzilla.kernel.org/show_bug.cgi?id=60606
Bug ID: 60606 Summary: vga_switcheroo / new Radeon DPM code mess up fbcon Product: Drivers Version: 2.5 Kernel Version: 3.11.0-rc2 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: sebastien.fievet@free.fr Regression: No
Created attachment 106987 --> https://bugzilla.kernel.org/attachment.cgi?id=106987&action=edit radeon switch OFF / switch ON experiment
I am the happy owner of an hybrid Intel core i5 480M / AMD Radeon 6550M latop. - IGP is Intel ironlake - DGD is AMD radeon 6550M
I just installed kernel 3.11.0-rc2. switching the discrete GPU OFF via the vgaswticheroo works from within X or from the console : echo OFF > /sys/kernel/debug/vgaswitcheroo/switch cat /sys/kernel/debug/vgaswitcheroo/switch 0:IGD:+:Pwr:0000:00:02.0 1:DIS: :Pwr:0000:02:00.0 2:DIS-Audio: :Pwr:0000:02:00.1
I then tried to switch the radeon back ON from the console with X down : echo ON > /sys/kernel/debug/vgaswitcheroo/switch
It messed up the console display : screen turned to dominant grey scattered with coloured pixels making it unreadable, forcing me to reboot. The attachment is the excerpt of my kern.log file for my radeon switch OFF / switch ON experiment.
switch off is at [ 76.634983] switch on is at [ 2167.936488] or [ 2167.936517]
I also noticed : [ 5.457569] ACPI Warning: _SB_.PCI0.GFX0._DSM: Argument #4 type mismatch - Found [Integer], ACPI requires [Package] (20130517/nsarguments-95) [ 5.457739] ACPI Warning: _SB_.PCI0.GFX0._DSM: Argument #4 type mismatch - Found [Integer], ACPI requires [Package] (20130517/nsarguments-95)
which seems to be related to vgaswitcheroo setup, but I don't know if it's relevant or not.
Let me know if you need anything else. thanks for your help, Seb.