On 04/23/2012 05:56 PM, Daniel Vetter wrote:
On Mon, Apr 23, 2012 at 05:38:27PM +0200, Carsten Emde wrote: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 0xc0000000Here 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.Ok, so the polarity bit does work as advertised. But I still don't understand how your machine works, so assuming your machine has backlight control keys,
Yes it has, but they don't have any effect.Unfortunately, I have to leave now and will be away from the lab for two days. Will continue to work on the problem when I'll be back. For the time being, I let the two conditions, your new patch and the old quirk, coexist in the code.
Thanks,
-Carsten.
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