Wrong brightness values on Toshiba Satellite L755

[squareunix]

I had an older version of this driver installed on Xubuntu 12.04 on my Toshiba Satellite L755-1DR, and even though it wasn't on the "official" supported devices list it worked perfectly, I could set it from 0 to 127 and it would change accordingly. I even had set up a quick rudimentary script and bound it to two keys to change the brightness values on the go.

Recently I switched to Crunchbang Waldorf (also Debian-based) and wanted to set up the driver again so I downloaded the latest version and installed it but now I get some really weird brightness values:

root@crunchbang:/# cat /sys/class/backlight/nvidia_backlight/brightness
16758
root@crunchbang:/# cat /sys/class/backlight/nvidia_backlight/actual_brightness
16758
root@crunchbang:/# cat /sys/class/backlight/nvidia_backlight/max_brightness
127

If I set brightness to anything higher than 127 I get an error, but if I set it to 127 I get a really, really dark screen (can barely see anything), so I guess the driver is working but somehow it doesn't consider 127 as the max value anymore.

I saw in a similar thread the dev asked to do sudo modprobe -r nvidiabl && sudo modprobe nvidiabl screen_type=2 I get exactly the same result, same values, changing to 127 makes my screen really dark, etc. If I do sudo modprobe -r nvidiabl && sudo modprobe nvidiabl screen_type=3 I get:

root@crunchbang:/# cat /sys/class/backlight/nvidia_backlight/brightness
0
root@crunchbang:/# cat /sys/class/backlight/nvidia_backlight/actual_brightness
0
root@crunchbang:/# cat /sys/class/backlight/nvidia_backlight/max_brightness
127

BUT changing the brightness value does nothing at all.

EDIT: some extra stuff

root@crunchbang:/# lsmod | grep nvidiabl
nvidiabl               41733  0 
root@crunchbang:/# dmesg | grep -i nvidiabl
[   16.063755] nvidiabl: loading driver version 0.85
[   16.063787] nvidiabl: Supported Nvidia graphics adapter 10de:0dec:1179:fc50 detected
[   16.063840] nvidiabl: smartdimmer register at address 0xc261c084 mapped at address 0xffffc9000066c084
[   16.063845] nvidiabl: backlight type is raw
[   16.063916] nvidiabl: backup register value 0x4001f63b
[   16.063920] nvidiabl: using value 0x400 as maximum
[   16.063924] nvidiabl: using value 0x0 as off
[   16.063928] nvidiabl: using value 0x32 as minimum
root@crunchbang:/# lspci -nn
00:00.0 Host bridge [0600]: Intel Corporation 2nd Generation Core Processor Family DRAM Controller [8086:0104] (rev 09)
00:01.0 PCI bridge [0604]: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port [8086:0101] (rev 09)
00:16.0 Communication controller [0780]: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 [8086:1c3a] (rev 04)
00:1a.0 USB controller [0c03]: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 [8086:1c2d] (rev 04)
00:1b.0 Audio device [0403]: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller [8086:1c20] (rev 04)
00:1c.0 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 [8086:1c10] (rev b4)
00:1c.1 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 [8086:1c12] (rev b4)
00:1c.5 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 [8086:1c1a] (rev b4)
00:1c.6 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 7 [8086:1c1c] (rev b4)
00:1d.0 USB controller [0c03]: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 [8086:1c26] (rev 04)
00:1f.0 ISA bridge [0601]: Intel Corporation HM65 Express Chipset Family LPC Controller [8086:1c49] (rev 04)
00:1f.2 SATA controller [0106]: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller [8086:1c03] (rev 04)
00:1f.3 SMBus [0c05]: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller [8086:1c22] (rev 04)
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation Device [10de:0dec] (rev a1)
01:00.1 Audio device [0403]: NVIDIA Corporation GF108 High Definition Audio Controller [10de:0bea] (rev a1)
08:00.0 USB controller [0c03]: NEC Corporation uPD720200 USB 3.0 Host Controller [1033:0194] (rev 04)
09:00.0 Network controller [0280]: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) [168c:002b] (rev 01)
0a:00.0 Ethernet controller [0200]: Atheros Communications Inc. AR8151 v2.0 Gigabit Ethernet [1969:1083] (rev c0)
root@crunchbang:/# cat /sys/class/dmi/id/sys_vendor
TOSHIBA
root@crunchbang:/# cat /sys/class/dmi/id/product_name
SATELLITE L755

[guillaumezin]

Hello,

It should be fixed in upcoming version 0.86, please let me know

[squareunix]

Works great. Thanks!!

On 18 March 2014 20:31, Guillaume Zin [email protected] wrote:

Hello,

It should be fixed in upcoming version 0.86, please let me know

Reply to this email directly or view it on GitHubhttps://github.com/guillaumezin/nvidiabl/issues/79#issuecomment-37983742 .