Linux（Android）：如何禁用Intel DPST（显示节电技术） - i915驱动程序
I have an Android tablet (Teclast X98) with an extremely annoying feature that it constantly keeps adjusting the brightness of the display all by itself.
我有一个Android平板电脑(Teclast X98),它具有非常烦人的功能,它不断地自动调整显示器的亮度。
Initially I thought maybe the tablet has a faulty display unit - the pumping of the brightness is that annoying. After a lot of investigation I finally noticed this in dmesg:
最初我认为平板电脑有一个有故障的显示器 - 亮度的抽吸是令人讨厌的。经过大量的调查后,我终于在dmesg中注意到了这一点:
QL: i915_dpst_compute_brightness dpst factor = 7022.
QL: i915_dpst_compute_brightness dpst factor = 6987.
QL: i915_dpst_compute_brightness dpst factor = 6882.
Put DPST into Google and I find the Intel engineers came up with this:
http://en.wikipedia.org/wiki/Intel_Display_Power_Saving_Technology
将DPST放入谷歌,我发现英特尔工程师想出了这个:http://en.wikipedia.org/wiki/Intel_Display_Power_Saving_Technology
So it's not just the brightness that is adjusted, but also the chroma of the display, which leads to washed out colors in addition to the reduced backlight intensity.
因此,不仅可以调节亮度,还可以调节显示器的色度,除了降低背光强度外,还会导致褪色。
Next I try and find the driver where this is implemented. Giving the function name a shot on GitHub I found it in the i915 GPU driver.
接下来,我尝试找到实现此功能的驱动程序。在GitHub上给出了一个功能名称,我在i915 GPU驱动程序中找到了它。
Now I see in that the driver has a dpst.enabled setting.
现在我看到驱动程序有一个dpst.enabled设置。
Presumably there should be some way to set dpst.enabled to false.
据推测应该有一些方法将dpst.enabled设置为false。
Anyone have any clue how I could turn it off?
sysctl, /proc/...? There has to be some way to turn it off?
任何人都有任何线索我怎么能把它关掉? sysctl,/ proc / ...?必须有一些方法来关闭它?
1 个解决方案
#1
0
Well. That was surprisingly easy.
Not sure if this is the correct way to do it, but here's how I got rid of it:
好。这简直太容易了。不确定这是否是正确的方法,但这是我如何摆脱它:
echo 0 > /sys/class/drm/card0/power/i915_dpst
# Something keeps writing 1 into this file, so I just prevent it like this
busybox chmod gou-w /sys/class/drm/card0/power/i915_dpst
If someone knows a better way to disable it please add an answer.
如果有人知道更好的禁用方法,请添加答案。