HorizSync/VertRefresh ranges of LCD/Graphics card?
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From: Tuxedo on 5 Jan 2010 16:10 Does anyone know how to determine HorizSync and VertRefresh ranges of a screen to include in xorg.conf? Using slackware-12.2, I found some relevant info by for example: lspci -v | grep VGA 00:02:0 VGA compatible controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02) (prog-if 00 [VGA controller]) As well as more possible relevant X-windows bits by the 'lspci' tool: 00:02:0 VGA compatible controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02) (prog-if 00 [VGA controller]) Subsystem: Samsung Electronics Co Ltd Unknown device c00a Flags: fast devsel, IRQ 10 Memory at e8000000 (32-bit, prefetchable) [size=128M] Memory at e8000000 (32-bit, non-prefetchable) [size=512K] I/O ports at 1800 [size 8] Capabilities: [d0] Power Management 1 Kernel modules: intelfb HorizSync and VertRefresh are however not detailed anywhere easily findable on the manufacturers website or in hardware reviews etc., if anywhere. In the Slackware installed auto-generated xorg.conf file there's a note that the values which are already defined there are examples only and recommends one to refer to the monitor's manual for correct numbers. If running 'xorgconfig' these values are also asked for and appear to be important. Is this information even retrievable without vendor documentation? Thanks, Tuxedo
From: Grant on 5 Jan 2010 17:25 On Tue, 5 Jan 2010 22:10:45 +0100, Tuxedo <tuxedo(a)mailinator.com> wrote: >Does anyone know how to determine HorizSync and VertRefresh ranges of a >screen to include in xorg.conf? > >Using slackware-12.2, I found some relevant info by for example: >lspci -v | grep VGA >00:02:0 VGA compatible controller: Intel Corporation 82852/855GM Integrated >Graphics Device (rev 02) (prog-if 00 [VGA controller]) > >As well as more possible relevant X-windows bits by the 'lspci' tool: > >00:02:0 VGA compatible controller: Intel Corporation 82852/855GM Integrated >Graphics Device (rev 02) (prog-if 00 [VGA controller]) >Subsystem: Samsung Electronics Co Ltd Unknown device c00a >Flags: fast devsel, IRQ 10 >Memory at e8000000 (32-bit, prefetchable) [size=128M] >Memory at e8000000 (32-bit, non-prefetchable) [size=512K] >I/O ports at 1800 [size 8] >Capabilities: [d0] Power Management 1 >Kernel modules: intelfb > >HorizSync and VertRefresh are however not detailed anywhere easily findable >on the manufacturers website or in hardware reviews etc., if anywhere. In >the Slackware installed auto-generated xorg.conf file there's a note that >the values which are already defined there are examples only and recommends >one to refer to the monitor's manual for correct numbers. If running >'xorgconfig' these values are also asked for and appear to be important. > >Is this information even retrievable without vendor documentation? Usually the driver gets the info direct from the LCD, check what the xorg logfile has to say about screen detection. Grant. -- http://bugs.id.au
From: allend on 5 Jan 2010 18:54 On Jan 6, 8:10 am, Tuxedo <tux...(a)mailinator.com> wrote: > Does anyone know how to determine HorizSync and VertRefresh ranges of a > screen to include in xorg.conf? > Is this information even retrievable without vendor documentation? > > Thanks, > Tuxedo As far as i know, standard Slackware does not supply a tool for querying EDID data. However there are programs available. http://en.wikipedia.org/wiki/Extended_display_identification_data
From: Tuxedo on 6 Jan 2010 04:08 Grant wrote: [...] > Usually the driver gets the info direct from the LCD, check what the > xorg logfile has to say about screen detection. > > Grant. I checked my Xorg.O.log, and yes, it has much detail about the chipset and so on, however, most of it is not easy to understand and certainly no legible information about horizontal sync and vertical refresh range of the LCD exists in my logs. In case the driver knows the correct values, or just best-guesses them, it's probably not logged. Tuxedo
From: Grant on 6 Jan 2010 04:33
On Wed, 6 Jan 2010 10:08:58 +0100, Tuxedo <tuxedo(a)mailinator.com> wrote: >Grant wrote: > >[...] > >> Usually the driver gets the info direct from the LCD, check what the >> xorg logfile has to say about screen detection. >> >> Grant. > >I checked my Xorg.O.log, and yes, it has much detail about the chipset and >so on, however, most of it is not easy to understand and certainly no >legible information about horizontal sync and vertical refresh range of the >LCD exists in my logs. In case the driver knows the correct values, or just >best-guesses them, it's probably not logged. Put the log up here, maybe somebody recognise the interesting bits? Check what the LCD monitor reports with its OSD information. Grant. -- http://bugs.id.au |