Acer Aspire laptop too dark

7 réponses [Dernière contribution]
scarrman
Hors ligne
A rejoint: 12/22/2014

Acer Aspire 8943G, 16GB memory, i7 processor, mobile radeon HD5800. No known hardware problems. During boot-up of Trisquel, the screen brightness drops, maybe 50%. Hard reset(remove all connections and battery, and hold power switch for 15+ seconds) restores backlight to a good level. Happens every time I boot from Trisquel & remains that way when windows boots, until reset is performed. This laptop has 2 HDD's, so I did not allow the grub to be written to the Windows 7 drive. Trisquel is successfully installed on the second, sdb drive. New installation was today, 12/22/2014, installed from dvd, without selecting 'update during installation'. It appears this is not a new issue, any known fixes?

davidnotcoulthard (non vérifié)
davidnotcoulthard

Can you adjust the brightness on your monitor? (Without rebooting, perhaps using the keyboardor buttons around it).

Having said that, it might have a bit to do with the Radeon.

scarrman
Hors ligne
A rejoint: 12/22/2014

The brightness buttons on the laptop itself, and the corresponding ones on the external keyboard have F5/F6 set up to adjust brightness. Neither work. I wouldn't be surprised if it had something to do with the Radeon. Thanks.

Mzee
Hors ligne
A rejoint: 07/10/2013

I have Trisquel installed on an Acer Aspire 7739 and don't experience any problems like this. Did you install all the updates after installing the system? Maybe there is a fix already in the updated packages.

scarrman
Hors ligne
A rejoint: 12/22/2014

Do, didn't do any updates. Agreed, i'll try that. The laptop display is so hard to read when in that state, I'll use an external monitor to get updates. Thanks Mzee.

lembas
Hors ligne
A rejoint: 05/13/2010

Few things you could try is another

*Linux-libre kernel, e.g. a binary from http://www.jxself.org/linux-libre/

If this helps and you'd be willing to dig deeper you could compare the kernel configs to see what they do differently (although this will likely be a long list)

*free distro from https://www.gnu.org/distros/free-distros.html

if this helps then we'd at least know it's possible in the free world.

scarrman
Hors ligne
A rejoint: 12/22/2014

The updates installed. I was embarrased to find that the brightness could be adjusted in the settings panel, but the setting only lasts the one session. Next boot it comes on darkened, the brighness 'slider' at 0. I find if the brightness is as it should be, mine looks ok at about 60%, if I then boot into Windows it is the same. Doesn't his indicate that something is happening at the hardware level? It seems to be an issue relating to laptops only, and admittedly this is the first time i've installed Linux on anything other than a desktop machine. I've seen this or similar issues in forums elsewhere, dating back to 2011. Users say older kernels did not produce this issue, that it appeared somewhere between 2.6 & 3 versions. Not overly concerned about a solution, but if one should happen along, i'd like to try to implement it.

lembas
Hors ligne
A rejoint: 05/13/2010

Since you seem to be able to change the brightness, this thread might be of interest (long messy thread, sorry)

https://trisquel.info/en/forum/toutatis-brightness-control