On 04/23/2012 05:22 PM, Daniel Vetter wrote: > On Mon, Apr 23, 2012 at 05:06:53PM +0200, Carsten Emde wrote: >> On 04/23/2012 04:22 PM, Daniel Vetter wrote: >>> On Mon, Apr 23, 2012 at 04:00:23PM +0200, Carsten Emde wrote: >>> [..] >>> The idea was to boot with kms and see whether any of these values would >>> restore the backlight. Writing to CTL1 should change anything in CTL2. >> Ah, sorry, ok. Removed the quirk again and tested the various settings: >> >> -> Initial screen: dark >> >> # intel_reg_write 0x61250 0x80000000 >> Value before: 0xE0000000 >> Value after: 0x80000000 >> -> Still dark >> >> # intel_reg_write 0x61250 0xa0000000 >> Value before: 0x80000000 >> Value after: 0xA0000000 >> -> Still dark >> >> # intel_reg_write 0x61250 0x90000000 >> Value before: 0xA0000000 >> Value after: 0x90000000 >> -> BACKLIGHT ON! >> >> # intel_reg_write 0x61250 0xb0000000 >> Value before: 0x90000000 >> Value after: 0xB0000000 >> -> Still ON. > > Neat. Let's test two more: > > # intel_reg_write 0x61250 0xd0000000 > # intel_reg_write 0x61250 0xc0000000 Here we go. -> Initial screen: dark # intel_reg_write 0x61250 0xd0000000 Value before: 0xE0000000 Value after: 0xD0000000 -> BACKLIGHT ON! # intel_reg_write 0x61250 0xc0000000 Value before: 0xD0000000 Value after: 0xC0000000 -> Dark again. -Carsten.
