On Tue, Mar 20, 2012 at 01:07:05PM +0100, Takashi Iwai wrote: > Currently i915 driver checks [PCH_]LVDS register bits to decide > whether to set up the dual-link or the single-link mode. This relies > implicitly on that BIOS initializes the register properly at boot. > However, BIOS doesn't initialize it always. When the machine is > booted with the closed lid, BIOS skips the LVDS reg initialization. > This ends up in blank output on a machine with a dual-link LVDS when > you open the lid after the boot. > > This patch adds a workaround for that problem by checking the initial > LVDS register value in VBT. > > Reviewed-by: Rodrigo Vivi <rodrigo.vivi at gmail.com> > Reviewed-by: Adam Jackson <ajax at redhat.com> > Signed-off-by: Takashi Iwai <tiwai at suse.de> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=37742 Not tested by the reporter, but sounds exactly like the issue this patch here tries to fix. -Daniel -- Daniel Vetter Mail: daniel at ffwll.ch Mobile: +41 (0)79 365 57 48
