M4800 Owner's Thread

Well things have got better so thanks for pointing me in the right direction... I started fiddling with the battery performance profiles which did no good.

I then changed the 'choose what closing the lid does' profile from my favoured 'do nothing' to 'sleep' and this has cured the crashing. I now have a laptop that I just have to awake rather than having to reboot every time I close the lid. It just seems bizarre. Anyone else care to see if they can replicate.

 

Unfortunately BIOS A07 is a performance nightmare at least under Linux if you use power supplies for previous laptop generations. I didn't check the behaviour under Windows.

With any power supply <180W the CPU gets limited by the BIOS to 800MHz, plus probably various other limitations resulting in a performance worse then a 10+ year old Dell D800.

The performance of the best RAID-6 checksumming
function went to <2.9GB/s.
On Battery it is at > 26.8GB/s
With a 180W PS it is at >36.7GBs

So far I had been able to use my power supplies from my D800 and D830 with a bit of a performance impact, but nothing that hurt too much. With the new A7 BIOS my M4800 it operates a glacial speeeeedsssss and is by far slower then even my old D800. A boot from an SSD that used to take seconds now takes several minutes. This is simply not acceptable.


The Fixes list for the BIOS shows as the first two points:
Fixes:
1. Fix AC Adapter wattage will not updated in BIOS setup when dock attach AC adapter.
2. Fix BIOS cannot determine AC power adapter wattage and type.

I guess point 2 of the A7 fixes list should really read:
2. Cripple performance when a power supply <180W is detected.

Point 1 is wrong as well, as A6 always showed me a correct warning message when I had attached a 130W or 90W power supply. The performance was being limited as well, but by far not as much. Maybe to the level the M4800 now runs on battery.

For me this means the I am going back to the A6 BIOS.

 

That is exactly what one of the bioses for the E6540 did - even using a 120v instead of the 130v kicked it down to 800mhz max.

 

Does anyone have a mSATA SSD installed and tested with CrystalDiskMark or something? The manual and every post etc. I've read states that the mSATA port is SATA 2 and one old post says SATA 3. I'm wondering what actual speeds it gets.

 

I'd be extremely surprised if it was only SATA II.


Sent from my iPad using Tapatalk

 

Just switched from Lenovo to a custom M4800 (4900MQ, 2100K, 1080p) with linux. I have a strange problem someone maybe can confirm regarding WoL (which I need).
If I shutdown Windows everything is fine. But if I shutdown Linux on the dock it reboots a moment later. This does not occur if the machine is not on the dock and even not if I put it after the shutdown on it (WoL is enabled then, as the lan lights inicating).
Tried Ubuntu 12.04, 13.10, Arch; Bios A06 and A07.

So maybe someone with linux may try to shutdown a linux (could be a live CD) with activated WoL on his dock?

Thanks in advance
X

 

cant help yet will try next week when I'll get replacement, but Lenova is utter rubbish now a days. just like me you had 3 choices probably. Dell HP MAC

those who want to have working WANN in m4800 with QHD may not be able to do that, as it seems to miss the guts relating to antenna.
even fully customizable option on Dell Website gives error when you try to add WANN 4G along side of your chosen QHD. but with 1080p alls well.

 

I get 499.4 MB/s sequential read and 251.7 MB/s sequential write from a Crucial M4 mSATA SSD in the M4800.

 

It's SATA 3. I bought a Lite On Plextor M5M 256GB from Amazon Warehouse and it works great.

 

I originally bought the M4800 with the FHD display. I thought it would be fine and for $1312 (the current $1569 configuration, less 10% and an extra $100 discount), it was a great deal. I use it mainly for Lightroom and Photoshop and I just couldn't live with the bluish tint. I calibrated the screen twice but it couldn't come close to the Dell 2410 display I normally use. I returned it and got the QHD display and I really love the machine now. The color is very close to my 2410's. I know I gave up Optimus and had to pay a premium, but it's worth it to me. And, yes, the Photoshop icons are micro, but if you've used it enough you know what each icon does anyway, and the image area is huge. Now the only problem (besides shorter battery life) is my 2410 monitor's resolution is noticeably less sharp than the QHD's.