Laptop resolution with the savage driver and xorg 7.1.1

[Bernat Tallaferro]

Hi,

I was wondering if someone could shed some light on a problem I've got
with the 'savage' driver.

According to the output of lspci, my laptop has got the following
graphics card:

01:00.0 VGA compatible controller: S3 Inc. 86C380 [ProSavageDDR K4M266]
(rev 02)
(which according to Xorg.0.log is a "Twister PN133", Chip: id 8d01)

on the AGP bus:

00:00.0 Host bridge: VIA Technologies, Inc. VT8605 [ProSavage PM133]
00:01.0 PCI bridge: VIA Technologies, Inc. VT8605 [PM133 AGP]

reading 'man savage', I see that these chips, and in particular 8d01
seem to be supported, so I tried to use the savage driver, since the
vesa driver I had been using until xorg 7.0.0 has become unbearably slow
after updating to 7.1.1 (which I'm using now).

The problem I've got is that although the driver and X load fine, I can
only get a maximal resolution of 800x600, which makes the laptop's
screen look awful, as it's got a native resolution of 1024x768 -which I
could use with the 'vesa' driver, at least.

Now my xorg.conf is very simple:

[...]
Section "Device"
	Identifier	"Generic Video Card"
	Driver		"savage"
	BusID		"PCI:1:0:0"
EndSection
[...]

where the only mode which interests me is 1024x768, as in:

	SubSection "Display"
		Depth		24
		Modes		"1024x768" "800x600" "640x480"
	EndSubSection

[...]

However, after having a had look at Xorg.0.log, I see that all the
1024x768 modes are dropped for some reason or the other. Here are some
bits of it which caught my attention:

[...]
(--) SAVAGE(0): Detected current MCLK value of 14.318 MHz
(--) SAVAGE(0): 1024x768 TFT LCD panel detected and active
(--) SAVAGE(0): - Limiting video mode to 1024x768
(II) SAVAGE(0): Generic Monitor: Using default hsync range of
31.50-37.90 kHz
(II) SAVAGE(0): Generic Monitor: Using default vrefresh range of
50.00-70.00 Hz
(II) SAVAGE(0): Clock range:  10.00 to 220.00 MHz
[...]
(II) SAVAGE(0): Not using default mode "1024x768" (vrefresh out of
range)
(II) SAVAGE(0): Not using default mode "512x384" (vrefresh out of range)
(II) SAVAGE(0): Not using default mode "1024x768" (hsync out of range)
(II) SAVAGE(0): Not using default mode "512x384" (hsync out of range)
(II) SAVAGE(0): Not using default mode "1024x768" (hsync out of range)
(II) SAVAGE(0): Not using default mode "512x384" (hsync out of range)
(II) SAVAGE(0): Not using default mode "1024x768" (hsync out of range)
(II) SAVAGE(0): Not using default mode "512x384" (hsync out of range)
(II) SAVAGE(0): Not using default mode "1024x768" (hsync out of range)
[...]
(II) SAVAGE(0): Not using default mode "1024x768" (hsync out of range)
(II) SAVAGE(0): Not using default mode "2048x1536" (bad mode
clock/interlace/doublescan)
(II) SAVAGE(0): Not using default mode "1024x768" (hsync out of range)
(II) SAVAGE(0): Not using mode "1024x768" (no mode of this name)
(--) SAVAGE(0): Virtual size is 800x600 (pitch 800)
(**) SAVAGE(0): *Default mode "800x600": 40.0 MHz, 37.9 kHz, 60.3 Hz
(II) SAVAGE(0): Modeline "800x600"   40.00  800 840 968 1056  600 601
605 628 +hsync +vsync
[...]

So I basically end up with a maximum 800x600 mode.

I have tried to use the

Option    "UseBIOS" "no"

which I seem to understand that needs to be used in conjunction with

Option "LCDClock" "frequency"

Now my limited knowledge tells me that this might be the solution to the
problem, that is, specifying a correct LCD clock frequency which allows
me to use the 1024x768 mode with 24 bit colour depth. The only trouble
is now which frequency to use. I've got no idea where to look for this,
is there any way to find out? Or is my problem something completely
different?

The other thing I was having a look at, is that hsync and vrefresh are
taken from the default values, so maybe should I specify appropriate
ones?

I do not want to experiment on this one, since the last thing I want is
to fry my laptop's screen by specifying a wrong frequency, so any
pointers will be more than welcome.

Many thanks in advance.