[SOLVED] HP screen brightness F12

[seaoss]

I am using fedora-12 64bit (XFCE desktop) on my hp laptop (see sig)
I have the latest kernel (2.6.32.10-90.fc12.x86_64) and updates.

On boot - when the blue screen with teardrop comes up, i can see the screen is bright, as the teardrop fills the brightness drops considerably. I have looked through settings and the only thing i can find with brightness is in the desktop settings but this only affects my desktop wallpaper - not the overall brightness of the screen.

Is this connected to video drivers? I am running the nouveau driver and I get an error on boot up about a suspected broken bios and something referring to the nouveu but its so fast i can't read it. I have booted runlevel 3 to try to install the latest nvidia driver but i get a kernel issue - no nvidia.ko.

I really would like some brightness control - any ideas? (my fn+brightness keys also don't work)

[CSchwangler]

Is the message about the BIOS similar to these common problems?

https://fedoraproject.org/wiki/Commo...IOMMU_handling

It should not happen on x86_64, but who knows.

If that is not the problem, it would be good if you could post the complete error message.

[seaoss]

I've yet to find an efficient way to find the error messages in the logs...
bios error is not the ones in the link but reads as follows

Fail in evaluating the _REG object of EC device. Broken bios is suspected.

i think the nouveau message is

nouveau 0000:01:00.0: Pointer to BIT loadval table invalid

but it flashes very quickly

[BugRocks1]

http://www.linuxhq.com/kernel/v2.6/32/drivers/acpi/ec.c

EC = Embeded Controller

if (ACPI_FAILURE(status)) {
+      if (status == AE_NOT_FOUND) {
+         /*
+          * Maybe OS fails in evaluating the _REG object.
+          * The AE_NOT_FOUND error will be ignored and OS
+          * continue to initialize EC.
+          */
+         printk(KERN_ERR "Fail in evaluating the _REG object"
+            " of EC device. Broken bios is suspected.\n");
+      } else {
+         acpi_remove_gpe_handler(NULL, ec->gpe,
+            &acpi_ec_gpe_handler);
+         return -ENODEV;

---------- Post added at 08:36 AM CDT ---------- Previous post was at 08:34 AM CDT ----------

http://www.opensubscriber.com/messag...m/9845549.html

---------- Post added at 08:54 AM CDT ---------- Previous post was at 08:36 AM CDT ----------

+static int parse_bit_A_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
+{
+	/*
+	 * Parses the load detect values for g80 cards.
+	 *
+	 * offset + 0 (16 bits): loadval table pointer
+	 */
+
+	uint16_t load_table_ptr;
+	uint8_t version, headerlen, entrylen, num_entries;
+
+	if (bitentry->length != 3) {
+		NV_ERROR(dev, "Do not understand BIT A table\n");
+		return -EINVAL;
+	}
+
+	load_table_ptr = ROM16(bios->data[bitentry->offset]);
+
+	if (load_table_ptr == 0x0) {
+		NV_ERROR(dev, "Pointer to BIT loadval table invalid\n");
+		return -EINVAL;
+	}

For the brightness problem maybe disabling ACPI support may solve that.

[ozjd]

If you want to install the nvidia drivers see the nvidia thread in my signature. It is the preferred method in Fedora.

[seaoss]

Originally Posted by ozjd

If you want to install the nvidia drivers see the nvidia thread in my signature. It is the preferred method in Fedora.

i have looked through this thread several times and cannot find the bit for 64-bit.
I have tried several times to install proprietry drivers as the process is supposed to be easy (i have a friend with 64bit who has done it several times and i followed the exact same steps) - it just doesn't seem to want to know my system

[ozjd]

The commands given will work for 64 bit, I'm on a 64 bit machine now with it installed, yum automatically selects the correct arch for you. Only those using the pae kernel need a special command.

[seaoss]

well duh at me! right clicked the panel and added the item that control LCD Brightness - gave me a scroll bar thing that was as low as possible... its now 2 thirds up and a good brightness -it would give me a headache on full i think!

ETA: xfce4-brightness-plugin 0.8.5 is the plugin for the panel - now to get my fn keys to work...