Unable to set gamma

jr_bob_dobbs · 08-29-2014, 09:42 AM

I am unable to set gamma. Both xrandr and xgamma fail to change the screen gamma. My attempts to find a third program to set gamma have only resulted in programs that themeselves call xrandr or xgamma.

Is there a third program for setting gamma?

Thank you in advance.

Using Debian Wheezy 64. The graphics card details, according to this extract from a run of "lspci -vv -k" are ...

Code:

00:02.0 VGA compatible controller: Intel Corporation Haswell Integrated Graphics Controller (rev 06) (prog-if 00 [VGA controller])
	Subsystem: Toshiba America Info Systems Device fa89
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 49
	Region 0: Memory at d3000000 (64-bit, non-prefetchable) [size=4M]
	Region 2: Memory at c0000000 (64-bit, prefetchable) [size=256M]
	Region 4: I/O ports at 6000 [size=64]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
		Address: fee0f00c  Data: 4162
	Capabilities: [d0] Power Management version 2
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [a4] PCI Advanced Features
		AFCap: TP+ FLR+
		AFCtrl: FLR-
		AFStatus: TP-
	Kernel driver in use: i915

ferrari · 08-30-2014, 07:17 PM

This is the first time that I've read about such a problem. Does this relate to a laptop display, or an external monitor (which has its own colour adjustment)? I would like to have seen the output listed with 'xrandr'. Did you get any error(s) reported when you tried to adjust the gamma values?

FWIW, my ageing laptop has intel graphics hardware, and gamma can be adjusted using

Code:

xrandr --output LVDS1 --gamma 0.9:0.9:0.9

Which desktop are you using? KDE provides System Settings >> Display and Monitor, where gamma adjustments can be made and made permanent on login. I/m not a Gnome user, but AFAIK there is a 'gnome-color-manager' utility that can be used to make gamma changes if required.

jr_bob_dobbs · 09-03-2014, 05:46 PM

Thank you for the reply. Yes, this is a laptop. No, it does not have a " LVDS1". Man, laptops hate linux. Frikken drivers. *Sigh*. I never really did solve the problem.

I instead wiped Wheezy ("Stable") and then installed Jessie ("Testing"). Now xgamma works. Go figure.

ferrari · 09-03-2014, 06:09 PM

Oh well, it looks like a kernel upgrade fixed the issue (as is often the case), and often it is newer hardware that experiences issues like this. Remember, usually it is the hardware vendors that make life difficult for Linux users.